Nortel Communication Server 1000S Installation And Configuration Manual page 97

Figure 31
Clock Controller - Option 1
Secondary Reference
Primary Reference
ISDN Primary Rate Interface equipment overview
DDP
Clk 0
Port 0
Clk 1
Clk 0
Port 1
Clk 1
One Reference from each port
ISDN Primary Rate Interface
Secondary Ref
Primary Ref
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Installation and Configuration
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CC for CPU
J1 Sec
J2 Pri